Department of Homeland Security secretary Janet Napolitano is scheduled to be in Southern Arizona today meeting with Border Patrol officials.

The former Arizona governor’s visit comes three days after Border Patrol agent Brian Terry was fatally shot west of Rio Rico in what the agency’s union has described as a gun battle with bandits.

Napolitano is scheduled to visit Tucson and Nogales before flying back to Phoenix. She is not scheduled to speak to the media in Southern Arizona.

The Border Patrol is referring all questions to the FBI, which is not providing any new information about the shooting.

Four suspects were taken into custody on Wednesday but authorities still have not found the fifth suspect, said Santa Cruz County Sheriff Tony Estrada. Santa Cruz County Sheriff’s deputies have been assisting federal agents in the manhunt since late Tuesday night. The more time passes, the less likely it becomes that they will find the man, he said.

“The chances get slimmer and slimmer,” Estrada said.

He is scheduled to meet with Napolitano later today during her visit to Nogales.

“I’m sure her number one priority will be to offer condielsenses and convey to the troops down there,” Estrada said. “And also to assure them that Washington and the U.S. governmentt will continue to support them as much as they need.”

Read more in Saturday’s Arizona Daily Star.